Near-infrared fluorescent divalent RGD ligand for integrin αvβ3-targeted optical imaging
摘要:
A new near-infrared fluorescent compound containing two cyclic RGD motifs, cypate-[c(RGDfK)](2) (1), was synthesized based on a carbocyanine fluorophore bearing two carboxylic acid groups (cypate) for integrin alpha(v)beta(3)-targeting. Compared with its monovalent counterpart cypate-c(RGDfK) (2), 1 exhibited remarkable improvements in integrin alpha(v)beta(3) binding affinity and tumor uptake in nude mice of A549. The results suggest that cypate- linked divalent ligands can serve as an important molecular platform for exploring receptor-targeted optical imaging and treatment of various diseases. (C) 2012 Elsevier Ltd. All rights reserved.